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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '694802c2435e5a2849fb3acbecc887dd70b5eb5686b38976b1d20a1021dafae2' 
  AND token = 'sXNdGIYbpFAh8e7NkjGGlyUxfT5Dx2+F0qcuZZf2kJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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