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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a902e3cd3a0c5d0f77cb3e6acc4e30443a162893dd17246c364f2a959772471' 
  AND token = '5urSqbWjH6L1HFABBiNtzcZucBu9PyonEi1Dt1aVVE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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