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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13e591253b88d349f5521aa44dfc9b43019f49db6c042af08a66764c476e08bb' 
  AND token = '0V1d3R0JbSpJKpZOMPB3oCSr3UP7JKXD/Aa/tUOAM4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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