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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa0c96916719cd2306d1860538f0b56758a4925aa291de9e50b7537cfb8130e8' 
  AND token = '8QVpwco5Qrj1wWM7YX8eEXZDSrmBCgOqN1O/w0/7aQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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