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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01752075fbed5e832656f37bca2c5222d1d7299c31d2b91b8a20e7c3a17f710a' 
  AND token = '45VHXpKZdNLb6itgCPTkU2PqUEcWMi9pXhdOaOrGgoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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