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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5dfd44df9f52b216e05afca21798a2bc0c2fbd1bc767924d8ca2a45dbd9863c' 
  AND token = 'u9v0lh4fJB8oyFBVY0+XWRlgdd+42dpa64oPB4bD0HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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