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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a63aa4f9fdaeed85514dd3898945a1c32af94df32dccadc4c532f6790158877' 
  AND token = '0EusFJVl9SlEzdtREBMvRTWdusuozBy+aHuKq3mfv+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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