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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7adf11a90e046d1c38f5e5de09a96885fbf93231ccef3e9b1d0e2f0b31a19d9c' 
  AND token = 'sZQ2ybxDUeFuMsyhOOPgi1om1NJEVjgWod5v/6chZ9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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