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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6f7c97df9a11b3789f5bd3dc686a89e8dfd6a0c9b18caaced3152fb651ed105' 
  AND token = '8kNVNRWonQi7JgqJDyps5Xc6zKFrCq6hG7w213p2rec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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