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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ea52698ae2cbd6b77fc635bbf21698d0e28bfb6c6b5373040ffb7e55089dfbb' 
  AND token = 'CYRGs73HIn1AK7cG2ki8mxeGXrlwZl6NWQ6Oo7mPsXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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