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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '638ca731529825e619c7cebba5a09a606e32bf28e6ad60d4f249ef25a1ebfad9' 
  AND token = 't2OKKEpZKZZjeSIBZ1glnebgEpbX/zIdtX3w1boV3nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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