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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fddb5c9cd329ecd9b22ee97d1c4aabfc806b276de01fac59a4b86513204e12c3' 
  AND token = 'GhFlHLdb7PoMawgAE95qoSGc+NhTULuEK79HKeHKbpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}