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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecd597b108fdbe35c5dd2ab6caeaa3c7f278511449b4db8c2806f6d5c0220d35' 
  AND token = '7+S0TdhccUvPK5ap2CB9GnSHBpaGGPWL1dmfqR4yOGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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