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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1582c835e5c809238f88ee87cefd22424db59aeeffb3eaf27e209e77c9fed8a3' 
  AND token = 'jcA3+v1oXsf2bOz7m1LAJU/L0TUZwQFgw1n9J9ZnDzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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