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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc1a587f577b1fb70c0344f087b444ca64fd791acb199c94494fe6684101cc0d' 
  AND token = 'uNMNdAoUosUdcsvArkqq2oo2sr+VFAfP0OvJC9Bz6XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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