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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd3b75b2b5800ceb3cb7aca19602d0d707be595e28e55d8d2d9902b9dab1e630' 
  AND token = 'M351Lr6EyJ1t9r4BazKkKc+EE35xQdvtX4P3n3NW0jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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