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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea4cc2e19c93d770e08851de4d9a957d8b29b03408ea50f4fedab0d536fe121c' 
  AND token = '4mrDp2wfdIJw4RUanOoVHflZWyUVJQn+dV0ioK4wx8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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