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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '442d8afc5148e2d7b22187313ba9e22a68754f54eb5d61120426884c1b1b6c02' 
  AND token = 'ApjJjPeqoe00+y9iqxI1UHpFCle51eA+JbqaVmo1lEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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