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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd3094cc657a6fd26734599c34e74d3e8361c83ce66e8aecc8b1b368c3f7fa78' 
  AND token = '4A+HukEbpCsOToCl7mM0lKV1ykniAtz9fw/LD2NlxUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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