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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '021868caa4441048e5c6fb983289628f26207cdad824e62ddd023f8bb231dccc' 
  AND token = 'uQ7//zPNptrj/OVzos1xC2dhp1T6tsVCK3UA/tbTYko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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