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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ea3d5d34f22716dcac1a42322545621271746ff7bc44eec48387d74f4eb13e6' 
  AND token = 'XA7iQsSUbU+hJyWVOjLAe0QX3q6qPyEV4ZQ7n8Z1ROQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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