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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e29417964c25c3bcb48111045afe219ae328914317732274c6a5df535fe870c' 
  AND token = 'mqbl4sW8SwaDkevntNnUnT6tweB/Jx1HKNPAmR+OGfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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