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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07c9a01bad83190eee4bb28fc629c3e42894649351f2b022a48cdcda7e22a261' 
  AND token = 'H76coEfIW5pPAAbpI392BxFHw/2QuBNkKGTbyDWPZaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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