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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e5fabdff357da4bc2793233d1b5a077f29362af3d399629b1bf5540a174dcce' 
  AND token = 'VH5m37HM7pCCa9vDD2aIuA++JIqjsWyLxHbE6DkfBdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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