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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cde3dcdbf62ed784bca750a459fc6d8fe123e02e102a778c83c06ef1495ceee0' 
  AND token = '5JjWaPBS2uk6AMehNc3IxtwqnoYRIOCRlDu2YH2Pyx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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