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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '477e3ca8f19cdf5a140b3f8c170f4d818773a760c3df1950dc1b1c9653335693' 
  AND token = 'aYcqy20dUFN0dRIWYuGCyEaaVHQlfLhToUUy33EhpKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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