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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2b0cbaf78ee60d5ae8b03a922e5ae1d30cb024fd9c44c436e77bc3b7c1136bf' 
  AND token = '9xlNCLIaGuKxuH1XxvmBeWb1o8Fyzgm/w0B7Qc+P4Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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