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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '390674f7adbacd1c42dc43a73d0194f003bfd17c6b18c1deac4a68e0999cc50f' 
  AND token = '26UR4ugOWmYPlasOgWYDdeIkQlJvlQ1ndu2/Uwd4u24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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