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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b2e3fadecb192959797e54cac0412b36cff113a8a4eb237bc825adc11849231' 
  AND token = 'ysVu6x0sorG8f1z3YDQzNSNE14G6Ox+e3iU1V2hXym0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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