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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'feec99b711dba249eaf2a87fe4e3d0c60d234fbce06400bd83a9e1081ce5f1aa' 
  AND token = 'SWNKLE8DH2ulrMpD851K1pR7Y7gjSz9/tjZ4oTmZK8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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