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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f52d9703b57b1906db326fe338660818c274d166c5a1dbb0e80f269ab468763' 
  AND token = '/qiyqis/07erW6UBocSLhnxsxRMP3j43W0WEvfpApLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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