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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f96420d44616f99acf73f7ad916e253a0a65611a0107e141c3645c5c232c607c' 
  AND token = '3AzKehOa/8QWvrm0xah8f6yxqImiZJ2sC1aMiBPc5PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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