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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3be14fde0bab2f7a940928faa75a829be41a2f74ccc4f9e222f0f48bb9cfe9f4' 
  AND token = 'ycm4y8flnIDHwhR+pCaNtJ14oUYaCJHnkmp3a48afEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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