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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b3f8a418001fd651a975b7638b2f8efdf3faf187f8fbec42b87f882fc659f02' 
  AND token = 'xEy2KbY5qEhJOWch2b1IF+xGhdWrj5ZB+1Jy1+xEgt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01322

JSON explain

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