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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aab95931349cae175a2627ab6b403ba36583eda7c660544d11b13eb5764b2c25' 
  AND token = 'G+VXWM2HeS0kH4tZMDZDKwkZ2x6ldB51NPc3CsDg7XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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