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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4db4a33949d9e27277cd9a9dab56525d267ad73cda02037523ce2b13883d63b3' 
  AND token = '9bYU4XA32Zm9aqcMrrLWWASpmIvJKyRCykXTqpqUjAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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