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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '602b02bec8f88763b8d00575dd9c36b9f82b9f5a0a604476f869620e26e133f9' 
  AND token = 'CeLM6L/slykH75RwioDMd/r+tARlEFylKBHxLSFtEQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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