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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2b0b61db171c0bcf6a5d02145620de21e701788ccbd4ec882abd7891187be27' 
  AND token = 'CQCQVIXpYOW4Ord1jOW5x39f78B2n1yo2sDOuLiX1Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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