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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3d951f91e2edfd385be30599096092e3aaca91194754a23c1a539961970b66f' 
  AND token = 'F8imJvvQ+CIQe51EhjZUQApanBS/AFrUYF+ej0/dHsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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