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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0bdbbce1ee28d68d676334872d57effcf60a1dc585eef59fb191e6e1c54e157' 
  AND token = '9t34w04aOvk6ax+o8AQORl3wB+A3XAW7FUQ2SNqa600=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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