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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63bf13a59f86ae75e07ef33183832cfec19617d35cb44ac04bb55f2a09781053' 
  AND token = 'WLSIFEr1frOzwSomEFI1XoN+wvOLT7YF4h5rCvAKyUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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