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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df1f49a8f641d475ecb9238546705aa41be0016127c8029b441a62aba1a3bccc' 
  AND token = 'Ig1UnY7aBXRb1Us6DQP7iR6pSzq/A6TzHwOvfNaY0r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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