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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '319770363a2305752c8bed76840eec66fb3fbf2aa0fd2a35882b43c1012235dc' 
  AND token = 'rSLLpLTkuWIobxCciufna/ciEjxr8IPKP2DPzjRIMfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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