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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9dced81e4abadd486ecd0b7687fffb079f25169397eb13faf8e6b8acdfb4f1c' 
  AND token = '1CvfsUedJ/yCVfr2yTjH/TLnuRIPZ9bplXRrfOmnlM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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