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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8551a46ef02f06e2c020e5c15e84754a1dcbe59bd20bacdf31109738fd17ee08' 
  AND token = 'kjN4tjkPlJkF39Dk1/dbbtyWY9bS2+b8eS05QvRfENA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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