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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69a0e98cd692b35312693761d37906e4016682a243ddd623d2e80130ac013a14' 
  AND token = 'lKo6jTIjLo2QFLXwRx89Poq8HRDIqZfEVzNVGQ6pdq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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