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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb6b5c61dc9af1a71eb0e150b1f5c4d589df116d3912193a922c2f4e19b7896f' 
  AND token = '4fE+BEBatnvSNXuw+7VhcVybOcwbewEKYPpLBXh6Z1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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