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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7073f00e2ce8ea6d107de95c216c636ab50706f1ee0f2974f5a123508345f5e3' 
  AND token = '952h0GNJ/zEe4yac4TTKXznlvCp0MXoo02iCGOdrMnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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