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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44fc5f56f0fe1724eb2a23daa4dff18db86b0e3ee7c4c78ec9a1eea66051b257' 
  AND token = 'cRdcVYFk9la2kkyQz5/hg/mOWfsCKWs/GkPzYEBxLU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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