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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f48ec5094d7147621230a317feedcbaa2538f3cbea05083bec21492bfabe2cba' 
  AND token = 'l6CWzYDOvbrxdIS7qRvkkauC9vnoDG2eYz8Ekm1HC74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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